{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "Collectively these results demonstrate the broad utility of top - down directed molecular self - assembly in conjunction with chemical forces to control morphology and size of polymer colloids at the nanoscale ."}
{"Chemical": []}